How to deal with valve leakage, five reasons and ways to help you easily deal with valve leakage

How to deal with valve leakage, five reasons and ways to help you easily deal with valve leakage

Valve leakage is an extremely annoying thing for every customer. Once leakage happens, it usually causes that the work can not be carried out normally in the future. It is necessary to solve it immediately. LIKE VALVE produces five reasons and ways to help you easily handle VALVE leaks!

Leakage of oil circuit board and single flow valve

Reason:

1, casting iron casting quality is not high, oil circuit board and single flow valve body above the sand hole, loose mechanism, welding tumor and other shortcomings;

2, cold storage crack;

3, the welding is not good, there are welding tumors, welding, internal stress cracks and other shortcomings;

4. Pig iron valve is damaged after collision with hanging objects.

Maintenance methods:

1. Improve casting quality, carry out compressive strength test strictly in accordance with the provisions before installation;

2, the temperature in 0℃ and 0℃ within the valve, should carry out heat insulation or heat, the valve should be removed water storage;

3. Welding of oil circuit plate and single flow valve combined by electric welding should be carried out in accordance with relevant electric welding safety operation rules, and flaw detection and compressive strength test should also be conducted after welding; Branch bird culture education HVAC design Teacher Du

4. It is strictly forbidden to push and put hanging objects on the valve, and it is not allowed to hit pig iron and non-metal material valves with a hammer. The installation of large caliber valves should have a support frame.

Two, the leakage of the packing

The exposure of the valve, the proportion of the filler is relatively large.

Reason:

1, the filler is not used correctly, not resistant to material erosion, not resistant to valve high pressure or vacuum pump, high temperature or ultra-low temperature application;

2, packing installation is not correct, there are small instead of large, screw winding connection head is not good, loose under tightening and other shortcomings;

3, filler beyond the service life, has been aging, lack of ductility;

4, the valve stem precision is not high, bending, erosion, damage and other shortcomings;

5, the number of packing rings is not enough, the gland is not clamped;

6, gland, anchor bolts, and other components are damaged, so that the gland can not be clamped;

7, the actual operation is unreasonable, excessive force, etc.;

8, the gland tilt, the gap between the gland and the stem is too small or too large, resulting in stem damage, packing damage.

Maintenance methods:

1. Raw materials and forms of filler should be used according to the standard working conditions;

2, according to the relevant requirements of the appropriate installation filler, disk should be placed round by round clamping, connecting head should be 30℃ or 45℃;

3, the service life is too long, aging, damaged packing should be removed immediately;

4, valve stem bending, damage should be straightened, repair, serious damage should be removed immediately;

5, the packing should be installed in accordance with the specified number of laps, the gland should be symmetrical and tightly, the pressure sleeve should have more than 5mm torque gap;

6, the damaged gland, anchor bolts and other components, should be repaired or removed immediately;

7, should follow the safety operation rules, except the collision type spindle, with normal speed of the actual operation of energy;

8, should be symmetrical and symmetrical to tighten the gland anchor bolt, gland and stem gap is too small, as far as possible to expand the gap; Gland and stem clearance is too large, should be removed.

Three, protruding leakage

Reason:

1, surface grinding uneven, can not produce close line;

2, the valve stem and close parts of the connection center hanging in the air, skewed or damaged;

3, the valve stem bent or installation skew, so that the closed parts tilt or do not meet the middle;

4, the surface material quality is unreasonable or not according to the working status of the standard valve.

Maintenance methods:

1, according to the working conditions of the standard appropriate use of British gasket raw materials and form;

2, carefully adjust, stable actual operation;

3, the anchor bolts should be symmetrical and symmetrical, and the torque wrench should be used when necessary. The pretightening force should meet the requirements, not too large or small. Flange and flange connection should have a certain torque gap;

4, gasket installation should meet the middle alignment, bearing force symmetrical, gaskets are not allowed to rebar lap and the application of double gaskets;

5, static protruding surface erosion, damage production and processing, processing quality is not high, should carry out maintenance, grinding, color inspection, make the static protruding surface in line with relevant provisions;

6, when installing the washer, pay attention to cleaning, using gasoline to clear the surface, and the washer can not fall.

Four, the leakage of the joint of the sealing ring

Reason:

1. The sealing ring is not pressed tightly;

2, the sealing ring and itself welding, spray welding quality is poor;

3, sealing ring connection external thread, screw, pressure ring loose;

4. The sealing ring is connected and eroded.

Maintenance methods:

1, sealant should be injected into the leakage of the sealing rolling and then rolling fixed;

2. The sealing ring shall be welded again according to the welding standard. Spray welding can not be repaired to the original spray welding and production processing;

3. Remove the screws, clean the pressure ring, remove and replace the damaged components, grind the sealing surface and the connecting seat, and reassemble. The components with large erosion damage can be repaired by welding or bonding.

4, the sealing ring connection surface is corroded, can be repaired by grinding, bonding and other ways, can not repair should be removed when the sealing ring.

Five, turn off the piece fell down to cause leakage

Reason:

1, the actual operation is not good, so that the closed parts are stuck or beyond the upper dead point, the connection is damaged and broken;

2, turn off the connection is not firm, loose and fall down;

3, the coupling material is not correct, can not withstand the corrosion of the material and mechanical equipment damage.

Maintenance methods:

1, proper practical operation, close the valve can not be too strong, open the valve can not be higher than the top dead point, after the valve is fully opened, the spindle should reverse a small amount;

2. The connection between the closing part and the valve stem should be firm, and the flange connection should have a return part;

3, the standard parts connected with the valve stem should withstand the erosion of the material, and have a certain impact toughness and wear resistance.